Return to the Basements Forum | Post a Follow-Up

 o
Insulating a vented crawlspace

Posted by betsymcl (My Page) on
Sun, Jul 27, 08 at 10:16

Hello,

We added on a family room several years ago that has a crawlspace underneath. It has always been cold in the family room in the winter.

The crawlspace is vented with a concrete floor and concrete walls. There is insulation in the floor of the family room already. There are heating ducts which run through the crawlspace which are round, flexible and also insulated, with black plastic (similar material to a heavy duty trashbag) on the outside.

We were wondering if it might be useful to block the vents, and insulate the walls. We're thinking there may not be as much heat loss through the ducts, and also having the crawlspace warmer might keep the room above warmer.

Any thoughts are appreciated!!

Betsy


Follow-Up Postings:

 o
RE: Insulating a vented crawlspace

Generally speaking, I think you can do that. But if the vents are closed, I believe you would have to lay down a vapor barrier over the concrete also (since it would release moisture that would get trapped in there).

Better wait for other opinions, though.


 o
RE: Insulating a vented crawlspace

What you propose is more common in newer, better-built homes. Check the link below to buildingscience.com for the details of how to do a conditioned crawlspace properly.

http://www.buildingscience.com/documents/reports/rr-0509d-crawlspaces

Here is a link that might be useful: Conditioned Crawlspace


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Basements Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here